View Full Version : idle surge when brakes applied
Campbell
06-26-2011, 07:15 PM
Hi, is it normal for the engine to surge a couple hundred rpm when the brakes applied and released at idle? Its a A2 (1987) scirocco. I'm wondering if the vacuum booster is bad - have changed vacuum lines. Thx
Matt93SE
06-27-2011, 10:44 AM
If it's a short-term surge, that sounds iffy but not too bad. If the idle moves and stays while you're on the brakes, then I'd suspect a bad booster.
another way to check is to stick a vacuum pump & gauge on the booster. Try to pull a vacuum on it and see if it bleeds down with time.
Flyinglizard
06-29-2011, 10:08 AM
Yes, it will move a little RPM.
Check the O ring on tha back of the MC. It needs one to seal, not many MC come with, and it is easy to leave out.
MM
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